Ultrafast dynamics of confined and localized excitons in low-dimensional semiconductors

Jorn M. Hvam; Wolfgang Langbein; Paola Borri

doi:10.1117/12.349310

24 May 1999 Ultrafast dynamics of confined and localized excitons in low-dimensional semiconductors

Jorn M. Hvam, Wolfgang Langbein, Paola Borri

Proceedings Volume 3624, Ultrafast Phenomena in Semiconductors III; (1999) https://doi.org/10.1117/12.349310
Event: Optoelectronics '99 - Integrated Optoelectronic Devices, 1999, San Jose, CA, United States

Abstract

Coherent optical spectroscopy in the form of nonlinear transient four-wave mixing (TFWM) and linear resonant Rayleigh scattering (RRS) has been applied to investigate the exciton dynamics of low-dimensional semiconductor heterostructures. The dephasing times of excitons are determined from the decay of the spectrally resolved non- linear signal as a function of the delay between the incident pulses in a two-beam TFWM experiment, and from the real time analysis of single speckles in RRS experiments (pure dephasing). From the density- and temperature- dependence of the dephasing times the exciton-exciton and the exciton-phonon interactions are determined. The degree of coherence of the secondary emission is determined from the speckle analysis.

Citation Download Citation

Jorn M. Hvam, Wolfgang Langbein, and Paola Borri "Ultrafast dynamics of confined and localized excitons in low-dimensional semiconductors", Proc. SPIE 3624, Ultrafast Phenomena in Semiconductors III, (24 May 1999); https://doi.org/10.1117/12.349310

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